[Bug middle-end/56301] [4.7 Regression] wrong code with the fix for PR53844

[rguenther at suse dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56301

--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> 2013-02-18 13:34:31 UTC ---
On Mon, 18 Feb 2013, jakub at gcc dot gnu.org wrote:

> 
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56301
> 
> Jakub Jelinek <jakub at gcc dot gnu.org> changed:
> 
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>                  CC|                            |jakub at gcc dot gnu.org
> 
> --- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-18 13:31:28 UTC ---
> Well, perhaps we need to improve documentation, because for calloc the memory
> doesn't have undefined contents either, it is well defined to be all zeros.

Well, it points to nothing ;)  The bug here is that probably
job_new links the allocated memory into some global list or so,
so it's not about initializing the memory but the fact that it
_is_ aliased by other things.

Yes, we can probably give a few examples of what is not appropriate
use of 'malloc'.

Do you think I should revert the patch on the branch nevertheless?
(it was a fix for a missed-optimization regression only ...)